Knotweed knowledge
August 12, 2013 10:54 AM

• U.S. origins date to the late 1800s, when it was imported from Asia as an ornamental plant.

• One variety, giant knotweed, can grow more than 10 feet tall; its leaves can exceed a foot long.

• Knotweed spreads quickly, crowding out native plants.

• Each flower cluster on a female knotweed plant can produce as many as 1,000 seeds.

• The most successful method of knotweed removal has been a combination of mechanical and chemical methods.

Source: Penn State Extension,

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